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        </div><article class="page single"><h1 class="single-title animated flipInX">Spring源码 - AOP 内置的五种MethodInterceptor源码解析</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="https://wlizhi.cc" title="Author" target="_blank" rel="noopener noreffer author" class="author"><i class="fas fa-user-circle fa-fw"></i>Wlizhi</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/spring/"><i class="far fa-folder fa-fw"></i>spring</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2020-12-02">2020-12-02</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 3776 字&nbsp;
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  <ul>
    <li><a href="#1-代理方法执行回顾">1 代理方法执行回顾</a></li>
    <li><a href="#2-methodbeforeadviceinterceptor">2 MethodBeforeAdviceInterceptor</a></li>
    <li><a href="#3-aspectjaroundadvice">3 AspectJAroundAdvice</a></li>
    <li><a href="#4-aspectjafteradvice">4 AspectJAfterAdvice</a></li>
    <li><a href="#5-afterreturningadviceinterceptor">5 AfterReturningAdviceInterceptor</a></li>
    <li><a href="#6-aspectjafterthrowingadvice">6 AspectJAfterThrowingAdvice</a></li>
    <li><a href="#7-argbinding-参数绑定">7 argBinding() 参数绑定</a></li>
    <li><a href="#8-invokeadvicemethodwithgivenargs-通知方法调用">8 invokeAdviceMethodWithGivenArgs() 通知方法调用</a></li>
  </ul>
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            </div><div class="content" id="content"><p>spring源码系列文章，示例代码的中文注释，均是 copy 自 <a href="https://gitee.com/wlizhi/spring-framework" target="_blank" rel="noopener noreffer">https://gitee.com/wlizhi/spring-framework</a> 。</p>
<p>链接中源码是作者从 github 下载，并以自身理解对核心流程及主要节点做了详细的中文注释。</p>
<hr>
<h2 id="1-代理方法执行回顾">1 代理方法执行回顾</h2>
<p>在代理对象方法被调用时，会获取到执行链，将其封装在 ProxyMethodInvocation 中，调用 proceed()，通过递归方式，依次调用执行链中的通知方法节点，最终会调用到代理方法，然后回转到调用处。回转过程中可能存在后置通知方法的节点调用，其顺序与前置的调用刚好相反。</p>
<p>多个切面通知方法，执行顺序实际上是环环相扣的，被代理方法在中间，与内存模型的栈有点类似，先进后出。</p>
<p>业务开发中我们自定义的切面共有五种，实际上并不是每种都常用。</p>
<p>列举这五种通知方法的MethodInterceptor实现类和对应注解：</p>
<ul>
<li>MethodBeforeAdviceInterceptor &ndash;&gt; @Before</li>
<li>AspectJAroundAdvice &ndash;&gt; @Around</li>
<li>AspectJAfterAdvice &ndash;&gt; @After</li>
<li>AspectJAfterReturningAdvice &ndash;&gt; @AfterReturning</li>
<li>AspectJAfterThrowingAdvice &ndash;&gt; @AfterThrowing</li>
</ul>
<h2 id="2-methodbeforeadviceinterceptor">2 MethodBeforeAdviceInterceptor</h2>
<p>MethodBeforeAdviceInterceptor.invoe() 中，封装了 MethodBeforeAdvice，在这个 Advice 中，通过调用 before()，来完成通知方法的调用。</p>
<p>首先会调用 before()，接着，调用 MethodInvocation.proceed()。继续向下递归，直到执行链的末尾，调用被代理方法，然后返回。</p>
<p>源码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">MethodBeforeAdviceInterceptor</span> <span class="kd">implements</span> <span class="n">MethodInterceptor</span><span class="o">,</span> <span class="n">BeforeAdvice</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="c1">// 封装了前置通知方法的具体执行内容。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>	<span class="kd">private</span> <span class="kd">final</span> <span class="n">MethodBeforeAdvice</span> <span class="n">advice</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">Object</span> <span class="nf">invoke</span><span class="o">(</span><span class="n">MethodInvocation</span> <span class="n">mi</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 调用advice.before()，执行内容封装的前置通知方法。调用MethodInvocation.proceed()，火炬传递。实际上就是一个递归调用。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">this</span><span class="o">.</span><span class="na">advice</span><span class="o">.</span><span class="na">before</span><span class="o">(</span><span class="n">mi</span><span class="o">.</span><span class="na">getMethod</span><span class="o">(),</span> <span class="n">mi</span><span class="o">.</span><span class="na">getArguments</span><span class="o">(),</span> <span class="n">mi</span><span class="o">.</span><span class="na">getThis</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">mi</span><span class="o">.</span><span class="na">proceed</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>来到 before() ：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AspectJMethodBeforeAdvice</span> <span class="kd">extends</span> <span class="n">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">MethodBeforeAdvice</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">before</span><span class="o">(</span><span class="n">Method</span> <span class="n">method</span><span class="o">,</span> <span class="n">Object</span><span class="o">[]</span> <span class="n">args</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">target</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 前置增强知识调用切面通知方法，并未理会参数中传递的目标对象、参数列表、以及方法
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">invokeAdviceMethod</span><span class="o">(</span><span class="n">getJoinPointMatch</span><span class="o">(),</span> <span class="kc">null</span><span class="o">,</span> <span class="kc">null</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>参数 JoinPointMatch 暂且忽略。</p>
<p>继续往下跟踪源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="n">Object</span> <span class="nf">invokeAdviceMethod</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">			<span class="nd">@Nullable</span> <span class="n">JoinPointMatch</span> <span class="n">jpMatch</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">returnValue</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Throwable</span> <span class="n">ex</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">			<span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取到绑定参数，调用通知方法。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">return</span> <span class="n">invokeAdviceMethodWithGivenArgs</span><span class="o">(</span><span class="n">argBinding</span><span class="o">(</span><span class="n">getJoinPoint</span><span class="o">(),</span> <span class="n">jpMatch</span><span class="o">,</span> <span class="n">returnValue</span><span class="o">,</span> <span class="n">ex</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>上面源码中有两个关键方法，invokeAdviceMethodWithGivenArgs()、argBinding()。它们的作用分别是执行通知方法、获取通知方法的参数。</p>
<p>由于五种拦截器调用和获取参数绑定的逻辑都是相同的方法，这两个方法放到后面列出。</p>
<h2 id="3-aspectjaroundadvice">3 AspectJAroundAdvice</h2>
<p>进入 invoke() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AspectJAroundAdvice</span> <span class="kd">extends</span> <span class="n">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">MethodInterceptor</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">Object</span> <span class="nf">invoke</span><span class="o">(</span><span class="n">MethodInvocation</span> <span class="n">mi</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">ProxyMethodInvocation</span> <span class="n">pmi</span> <span class="o">=</span> <span class="o">(</span><span class="n">ProxyMethodInvocation</span><span class="o">)</span> <span class="n">mi</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="n">ProceedingJoinPoint</span> <span class="n">pjp</span> <span class="o">=</span> <span class="n">lazyGetProceedingJoinPoint</span><span class="o">(</span><span class="n">pmi</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">JoinPointMatch</span> <span class="n">jpm</span> <span class="o">=</span> <span class="n">getJoinPointMatch</span><span class="o">(</span><span class="n">pmi</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 执行环绕通知方法，注意，这里相对AspectJAfterAdvice，多传递了了一个参数pjp，这里是一个MethodInvocationProceedingJoinPoint，
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 内部封装了代理调用对象ProxyMethodInvocation。也就是说，在环绕通知方法中，是可以拿到ProxyMethodInvocation，并可以在其方法任意位置
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 进行执行链的火炬传递。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">return</span> <span class="n">invokeAdviceMethod</span><span class="o">(</span><span class="n">pjp</span><span class="o">,</span> <span class="n">jpm</span><span class="o">,</span> <span class="kc">null</span><span class="o">,</span> <span class="kc">null</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>来到 lazyGetProceedingJoinPoint()：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AspectJAroundAdvice</span> <span class="kd">extends</span> <span class="n">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">MethodInterceptor</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">protected</span> <span class="n">ProceedingJoinPoint</span> <span class="nf">lazyGetProceedingJoinPoint</span><span class="o">(</span><span class="n">ProxyMethodInvocation</span> <span class="n">rmi</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="k">new</span> <span class="n">MethodInvocationProceedingJoinPoint</span><span class="o">(</span><span class="n">rmi</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>在 <code>new MethodInvocationProceedingJoinPoint(rmi)</code> 参数中，传递了一个 ProxyMethodInvocation，这个类是用来调用执行链中通知方法的。这里把它封装到了ProceedingJoinPoint中。</p>
<p>在 invokeAdviceMethod() 中将这个创建的 ProceedingJoinPoint 传递下去。我们在使用 @Around 时，会将 ProceedingJoinPoint 作为通知方法的参数，这个参数就来自这里。</p>
<p>接着，会执行到 invokeAdviceMethod()：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">protected</span> <span class="n">Object</span> <span class="nf">invokeAdviceMethod</span><span class="o">(</span><span class="n">JoinPoint</span> <span class="n">jp</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">JoinPointMatch</span> <span class="n">jpMatch</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">			<span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">returnValue</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Throwable</span> <span class="n">t</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取到绑定参数，调用通知。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">return</span> <span class="n">invokeAdviceMethodWithGivenArgs</span><span class="o">(</span><span class="n">argBinding</span><span class="o">(</span><span class="n">jp</span><span class="o">,</span> <span class="n">jpMatch</span><span class="o">,</span> <span class="n">returnValue</span><span class="o">,</span> <span class="n">t</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>最终，这里有两个方法调用，invokeAdviceMethodWithGivenArgs()、argBinding()。</p>
<h2 id="4-aspectjafteradvice">4 AspectJAfterAdvice</h2>
<p>invoke() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AspectJAfterAdvice</span> <span class="kd">extends</span> <span class="n">AbstractAspectJAdvice</span>
</span></span><span class="line"><span class="cl">		<span class="kd">implements</span> <span class="n">MethodInterceptor</span><span class="o">,</span> <span class="n">AfterAdvice</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">Object</span> <span class="nf">invoke</span><span class="o">(</span><span class="n">MethodInvocation</span> <span class="n">mi</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">try</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 先执行执行链，当所有执行链中的通知方法，及被代理方法执行完毕，会继续往下走。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// 最终，在finally语句块中，调用后置通知方法。卸载finally语句块里，是让在执行链中及被代理方法执行完毕，但还未返回时，执行后置通知方法。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// 这里有点绕。 A(around) -&gt; B(after) -&gt; C(around)，假设有这三个切面组成执行链，他们执行顺序按照前面的排序。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// 执行顺序是这样的：A环绕前置通知 -&gt; B invoke中通知调用执行链下一个节点（这里没有实际的执行内容，只是做一个火炬传递） -&gt; C环绕前置通知 -&gt; C环绕后置通知 -&gt; B后置通知（这时候B中调用完，返回前掉finally语句块） -&gt; A环绕后置通知。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">return</span> <span class="n">mi</span><span class="o">.</span><span class="na">proceed</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">finally</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">invokeAdviceMethod</span><span class="o">(</span><span class="n">getJoinPointMatch</span><span class="o">(),</span> <span class="kc">null</span><span class="o">,</span> <span class="kc">null</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>先将执行链中剩余节点执行完毕，在执行完之后，方法返回之前，finally块中调用了后置通知方法。仔细看下源码中注释部分。</p>
<p>接着到 invokeAdviceMethod()，与前面的一致，都是到这个方法：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">    <span class="kd">protected</span> <span class="n">Object</span> <span class="nf">invokeAdviceMethod</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">			<span class="nd">@Nullable</span> <span class="n">JoinPointMatch</span> <span class="n">jpMatch</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">returnValue</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Throwable</span> <span class="n">ex</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">			<span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取到绑定参数，调用通知方法。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">return</span> <span class="n">invokeAdviceMethodWithGivenArgs</span><span class="o">(</span><span class="n">argBinding</span><span class="o">(</span><span class="n">getJoinPoint</span><span class="o">(),</span> <span class="n">jpMatch</span><span class="o">,</span> <span class="n">returnValue</span><span class="o">,</span> <span class="n">ex</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><h2 id="5-afterreturningadviceinterceptor">5 AfterReturningAdviceInterceptor</h2>
<p>先调用执行链中剩余节点，拿到返回值之后，再调用 afterReturning() 通知方法。afterReturning() 中一样会调到 invokeAdviceMethod()。</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AfterReturningAdviceInterceptor</span> <span class="kd">implements</span> <span class="n">MethodInterceptor</span><span class="o">,</span> <span class="n">AfterAdvice</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">Object</span> <span class="nf">invoke</span><span class="o">(</span><span class="n">MethodInvocation</span> <span class="n">mi</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 首先执行执行链方法，当执行链中的通知方法、及被代理方法都执行完毕。才执行afterReturning方法。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Object</span> <span class="n">retVal</span> <span class="o">=</span> <span class="n">mi</span><span class="o">.</span><span class="na">proceed</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 执行afterReturning通知方法。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">this</span><span class="o">.</span><span class="na">advice</span><span class="o">.</span><span class="na">afterReturning</span><span class="o">(</span><span class="n">retVal</span><span class="o">,</span> <span class="n">mi</span><span class="o">.</span><span class="na">getMethod</span><span class="o">(),</span> <span class="n">mi</span><span class="o">.</span><span class="na">getArguments</span><span class="o">(),</span> <span class="n">mi</span><span class="o">.</span><span class="na">getThis</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">retVal</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>afterReturning() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AspectJAfterReturningAdvice</span> <span class="kd">extends</span> <span class="n">AbstractAspectJAdvice</span>
</span></span><span class="line"><span class="cl">		<span class="kd">implements</span> <span class="n">AfterReturningAdvice</span><span class="o">,</span> <span class="n">AfterAdvice</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="kt">void</span> <span class="nf">afterReturning</span><span class="o">(</span><span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">returnValue</span><span class="o">,</span> <span class="n">Method</span> <span class="n">method</span><span class="o">,</span> <span class="n">Object</span><span class="o">[]</span> <span class="n">args</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">target</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">shouldInvokeOnReturnValueOf</span><span class="o">(</span><span class="n">method</span><span class="o">,</span> <span class="n">returnValue</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">invokeAdviceMethod</span><span class="o">(</span><span class="n">getJoinPointMatch</span><span class="o">(),</span> <span class="n">returnValue</span><span class="o">,</span> <span class="kc">null</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>这里会传入 returnValue。</p>
<h2 id="6-aspectjafterthrowingadvice">6 AspectJAfterThrowingAdvice</h2>
<p>调用执行链中剩余的节点通知，当这些通知方法抛出异常，就执行当前通知方法。invokeAdviceMethod() 中会调用 invokeAdviceMethod()。</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AspectJAfterThrowingAdvice</span> <span class="kd">extends</span> <span class="n">AbstractAspectJAdvice</span>
</span></span><span class="line"><span class="cl">		<span class="kd">implements</span> <span class="n">MethodInterceptor</span><span class="o">,</span> <span class="n">AfterAdvice</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">Object</span> <span class="nf">invoke</span><span class="o">(</span><span class="n">MethodInvocation</span> <span class="n">mi</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">try</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 调用执行链，如果执行链中的剩余节点中，有任何一个节点抛出异常，在这里捕获，在catch语句块传递给afterThrowing通知方法。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">return</span> <span class="n">mi</span><span class="o">.</span><span class="na">proceed</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">catch</span> <span class="o">(</span><span class="n">Throwable</span> <span class="n">ex</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">shouldInvokeOnThrowing</span><span class="o">(</span><span class="n">ex</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">invokeAdviceMethod</span><span class="o">(</span><span class="n">getJoinPointMatch</span><span class="o">(),</span> <span class="kc">null</span><span class="o">,</span> <span class="n">ex</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">throw</span> <span class="n">ex</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>这里传入了异常对象。</p>
<h2 id="7-argbinding-参数绑定">7 argBinding() 参数绑定</h2>
<p>以下是 argBinding() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">protected</span> <span class="n">Object</span><span class="o">[]</span> <span class="nf">argBinding</span><span class="o">(</span><span class="n">JoinPoint</span> <span class="n">jp</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">JoinPointMatch</span> <span class="n">jpMatch</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">			<span class="nd">@Nullable</span> <span class="n">Object</span> <span class="n">returnValue</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Throwable</span> <span class="n">ex</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 计算参数绑定
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">calculateArgumentBindings</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// AMC start
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Object</span><span class="o">[]</span> <span class="n">adviceInvocationArgs</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Object</span><span class="o">[</span><span class="k">this</span><span class="o">.</span><span class="na">parameterTypes</span><span class="o">.</span><span class="na">length</span><span class="o">];</span>
</span></span><span class="line"><span class="cl">		<span class="kt">int</span> <span class="n">numBound</span> <span class="o">=</span> <span class="n">0</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 如果存在参数JointPoint，则在这里放入参数。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">joinPointArgumentIndex</span> <span class="o">!=</span> <span class="o">-</span><span class="n">1</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">adviceInvocationArgs</span><span class="o">[</span><span class="k">this</span><span class="o">.</span><span class="na">joinPointArgumentIndex</span><span class="o">]</span> <span class="o">=</span> <span class="n">jp</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="n">numBound</span><span class="o">++;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span><span class="c1">// 如果存在参数JoinPoint.StaticPart，则在这里绑定
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">else</span> <span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">joinPointStaticPartArgumentIndex</span> <span class="o">!=</span> <span class="o">-</span><span class="n">1</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">adviceInvocationArgs</span><span class="o">[</span><span class="k">this</span><span class="o">.</span><span class="na">joinPointStaticPartArgumentIndex</span><span class="o">]</span> <span class="o">=</span> <span class="n">jp</span><span class="o">.</span><span class="na">getStaticPart</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">			<span class="n">numBound</span><span class="o">++;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 省略...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">adviceInvocationArgs</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p><code>adviceInvocationArgs[this.joinPointArgumentIndex] = jp</code> 设置了 JoinPoint 参数。</p>
<p>看一下calculateArgumentBindings() 都做了什么：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="kd">final</span> <span class="kd">synchronized</span> <span class="kt">void</span> <span class="nf">calculateArgumentBindings</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">argumentsIntrospected</span> <span class="o">||</span> <span class="k">this</span><span class="o">.</span><span class="na">parameterTypes</span><span class="o">.</span><span class="na">length</span> <span class="o">==</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kt">int</span> <span class="n">numUnboundArgs</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">parameterTypes</span><span class="o">.</span><span class="na">length</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取切面通知方法的参数列表
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Class</span><span class="o">&lt;?&gt;[]</span> <span class="n">parameterTypes</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">aspectJAdviceMethod</span><span class="o">.</span><span class="na">getParameterTypes</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 从这里可以看出，方法的第一个参数必须是JoinPoint类型的
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">maybeBindJoinPoint</span><span class="o">(</span><span class="n">parameterTypes</span><span class="o">[</span><span class="n">0</span><span class="o">])</span> <span class="o">||</span> <span class="n">maybeBindProceedingJoinPoint</span><span class="o">(</span><span class="n">parameterTypes</span><span class="o">[</span><span class="n">0</span><span class="o">])</span> <span class="o">||</span>
</span></span><span class="line"><span class="cl">				<span class="n">maybeBindJoinPointStaticPart</span><span class="o">(</span><span class="n">parameterTypes</span><span class="o">[</span><span class="n">0</span><span class="o">]))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">numUnboundArgs</span><span class="o">--;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 类似这种 @Around(&#34;pc1()&#34;) around(ProceedingJoinPoint joinPoint)
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 方法只有一个参数，numUnboundArgs是0，就不需要参数绑定了
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">numUnboundArgs</span> <span class="o">&gt;</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 需要通过切入点匹配返回的名称绑定参数
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// need to bind arguments by name as returned from the pointcut match
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">bindArgumentsByName</span><span class="o">(</span><span class="n">numUnboundArgs</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">argumentsIntrospected</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><ol>
<li>获取通知方法参数的个数赋值给 numUnboundArgs，获取到通知方法的所有参数类型。</li>
<li>拿第一个参数，去判断是否符合条件，如果符合条件，将变量 numUnboundArgs 减一。</li>
<li>如果方法中参数有多个，需要调用 bindArgumentsByName()。</li>
</ol>
<p>看一下 maybeBindJoinPoint()，另外两个方法与这个类似：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">private</span> <span class="kt">boolean</span> <span class="nf">maybeBindJoinPoint</span><span class="o">(</span><span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">candidateParameterType</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">JoinPoint</span><span class="o">.</span><span class="na">class</span> <span class="o">==</span> <span class="n">candidateParameterType</span><span class="o">)</span> <span class="o">{</span><span class="c1">// 如果候选的参数类型是JoinPoint类型，则返回true，标识绑定成功。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">this</span><span class="o">.</span><span class="na">joinPointArgumentIndex</span> <span class="o">=</span> <span class="n">0</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span><span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>bindArgumentsByName会调用到bindExplicitArguments() ：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">private</span> <span class="kt">void</span> <span class="nf">bindExplicitArguments</span><span class="o">(</span><span class="kt">int</span> <span class="n">numArgumentsLeftToBind</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Assert</span><span class="o">.</span><span class="na">state</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">argumentNames</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">,</span> <span class="s">&#34;No argument names available&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">argumentBindings</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashMap</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取参数的数量
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="kt">int</span> <span class="n">numExpectedArgumentNames</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">aspectJAdviceMethod</span><span class="o">.</span><span class="na">getParameterCount</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	    <span class="c1">// 省略...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 参数索引偏移量，也就是前面已经绑定过的参数，需要跳过，这里记录的是跳过已绑定参数后的下一个索引值。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="kt">int</span> <span class="n">argumentIndexOffset</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">parameterTypes</span><span class="o">.</span><span class="na">length</span> <span class="o">-</span> <span class="n">numArgumentsLeftToBind</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">argumentIndexOffset</span><span class="o">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="k">this</span><span class="o">.</span><span class="na">argumentNames</span><span class="o">.</span><span class="na">length</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">this</span><span class="o">.</span><span class="na">argumentBindings</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">argumentNames</span><span class="o">[</span><span class="n">i</span><span class="o">],</span> <span class="n">i</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>  <span class="c1">// 省略部分代码...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 把参数对应的名称和对应的参数的类型设置到pointcut中
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// configure the pointcut expression accordingly.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">configurePointcutParameters</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">argumentNames</span><span class="o">,</span> <span class="n">argumentIndexOffset</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>获取到参数索引偏移量，这个偏移量是指前面已绑定的 JoinPoint。
来到 configurePointcutParameters() ：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">    <span class="kd">private</span> <span class="kt">void</span> <span class="nf">configurePointcutParameters</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">argumentNames</span><span class="o">,</span> <span class="kt">int</span> <span class="n">argumentIndexOffset</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="kt">int</span> <span class="n">numParametersToRemove</span> <span class="o">=</span> <span class="n">argumentIndexOffset</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">returningName</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">numParametersToRemove</span><span class="o">++;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">throwingName</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">numParametersToRemove</span><span class="o">++;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 这里装的是参数名称，排除了已绑定的JoinPoint
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">String</span><span class="o">[]</span> <span class="n">pointcutParameterNames</span> <span class="o">=</span> <span class="k">new</span> <span class="n">String</span><span class="o">[</span><span class="n">argumentNames</span><span class="o">.</span><span class="na">length</span> <span class="o">-</span> <span class="n">numParametersToRemove</span><span class="o">];</span>
</span></span><span class="line"><span class="cl">		<span class="n">Class</span><span class="o">&lt;?&gt;[]</span> <span class="n">pointcutParameterTypes</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Class</span><span class="o">&lt;?&gt;[</span><span class="n">pointcutParameterNames</span><span class="o">.</span><span class="na">length</span><span class="o">];</span>
</span></span><span class="line"><span class="cl">		<span class="n">Class</span><span class="o">&lt;?&gt;[]</span> <span class="n">methodParameterTypes</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">aspectJAdviceMethod</span><span class="o">.</span><span class="na">getParameterTypes</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="kt">int</span> <span class="n">index</span> <span class="o">=</span> <span class="n">0</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="n">0</span><span class="o">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">argumentNames</span><span class="o">.</span><span class="na">length</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">i</span> <span class="o">&lt;</span> <span class="n">argumentIndexOffset</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">continue</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">argumentNames</span><span class="o">[</span><span class="n">i</span><span class="o">].</span><span class="na">equals</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">returningName</span><span class="o">)</span> <span class="o">||</span>
</span></span><span class="line"><span class="cl">				<span class="n">argumentNames</span><span class="o">[</span><span class="n">i</span><span class="o">].</span><span class="na">equals</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">throwingName</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">continue</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 将参数名称，封装到pointcutParameterNames中，将参数类型封装到pointcutParameterTypes中。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">pointcutParameterNames</span><span class="o">[</span><span class="n">index</span><span class="o">]</span> <span class="o">=</span> <span class="n">argumentNames</span><span class="o">[</span><span class="n">i</span><span class="o">];</span>
</span></span><span class="line"><span class="cl">			<span class="n">pointcutParameterTypes</span><span class="o">[</span><span class="n">index</span><span class="o">]</span> <span class="o">=</span> <span class="n">methodParameterTypes</span><span class="o">[</span><span class="n">i</span><span class="o">];</span>
</span></span><span class="line"><span class="cl">			<span class="n">index</span><span class="o">++;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 将未绑定的参数名称数组、参数类型数组，封装到成员变量 pointcut。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">this</span><span class="o">.</span><span class="na">pointcut</span><span class="o">.</span><span class="na">setParameterNames</span><span class="o">(</span><span class="n">pointcutParameterNames</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">this</span><span class="o">.</span><span class="na">pointcut</span><span class="o">.</span><span class="na">setParameterTypes</span><span class="o">(</span><span class="n">pointcutParameterTypes</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>跳过已绑定的位置，从后面的索引开始，将通知方法中的参数名称按照下标索引封装到数组 pointcutParameterNames 中，将参数类型封装到 pointcutParameterTypes 中。</p>
<h2 id="8-invokeadvicemethodwithgivenargs-通知方法调用">8 invokeAdviceMethodWithGivenArgs() 通知方法调用</h2>
<p>通过反射，根据绑定的参数，方法，切面类，进行通知方法调用。</p>
<div class="highlight"><div class="chroma">
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractAspectJAdvice</span> <span class="kd">implements</span> <span class="n">Advice</span><span class="o">,</span> <span class="n">AspectJPrecedenceInformation</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">protected</span> <span class="n">Object</span> <span class="nf">invokeAdviceMethodWithGivenArgs</span><span class="o">(</span><span class="n">Object</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="kd">throws</span> <span class="n">Throwable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="n">Object</span><span class="o">[]</span> <span class="n">actualArgs</span> <span class="o">=</span> <span class="n">args</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">aspectJAdviceMethod</span><span class="o">.</span><span class="na">getParameterCount</span><span class="o">()</span> <span class="o">==</span> <span class="n">0</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">actualArgs</span> <span class="o">=</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 省略try块...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="n">ReflectionUtils</span><span class="o">.</span><span class="na">makeAccessible</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">aspectJAdviceMethod</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 根据绑定的参数，反射调用通知方法。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="c1">// TODO AopUtils.invokeJoinpointUsingReflection
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">return</span> <span class="k">this</span><span class="o">.</span><span class="na">aspectJAdviceMethod</span><span class="o">.</span><span class="na">invoke</span><span class="o">(</span><span class="k">this</span><span class="o">.</span><span class="na">aspectInstanceFactory</span><span class="o">.</span><span class="na">getAspectInstance</span><span class="o">(),</span> <span class="n">actualArgs</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>不同种类的 MethodInterceptor，有不同的实现，而最终调用时，都是通过反射进行方法调用的。</p></div>

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